Aubrey didn't know where Arlo had gone. After he stormed out of the room and threatened Michael, he kicked him out of the house and told him to never come back. He shouldn't have bothered with his business anymore.
And now, Arlo locked himself somewhere else inside this house, while Aubrey didn't have the energy to find him.
She knelt down and started to cry as the realization hit her hard. She cried until she couldn't anymore, and then when she stood up and looked at her own reflection in the mirror, she saw an ugly woman staring back at her.
"Arrghh!!!" Aubrey lost it. She started to punch the mirror with her bare hand.
Adrenaline rushed in her veins, and she could no longer feel the pain. She screamed and punched and screamed and punched again. She cried even harder. She yelled at her own reflection.
